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//go:build ignore
// +build ignore
package main
import (
. "github.com/mmcloughlin/avo/build"
. "github.com/mmcloughlin/avo/operand"
)
func main() {
TEXT("EncodeInt", NOSPLIT, "func(lat, lng float64) uint64")
Doc("EncodeInt computes the 64-bit integer geohash of (lat, lng).")
lat := Load(Param("lat"), XMM())
lng := Load(Param("lng"), XMM())
MULSD(ConstData("reciprocal180", F64(1/180.0)), lat)
onepointfive := ConstData("onepointfive", F64(1.5))
ADDSD(onepointfive, lat)
MULSD(ConstData("reciprocal360", F64(1/360.0)), lng)
ADDSD(onepointfive, lng)
lngi, lati := GP64(), GP64()
MOVQ(lat, lati)
SHRQ(U8(20), lati)
MOVQ(lng, lngi)
SHRQ(U8(20), lngi)
mask := ConstData("mask", U64(0x5555555555555555))
ghsh := GP64()
PDEPQ(mask, lati, ghsh)
temp := GP64()
PDEPQ(mask, lngi, temp)
SHLQ(U8(1), temp)
XORQ(temp, ghsh)
Store(ghsh, ReturnIndex(0))
RET()
Generate()
}
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